HTM2: Spatial Toolkit for the Virtual Observatory

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The hierarchical tringular mesh (HTM) is a discrete foundation for
describing location, size and shape on the celestial sphere. Indices
derived from HTM descriptors are used in a relational database for
managing spatial information. Some of the new features available in
the current implementation support operations such as the ability to
perform searches based on arbitrary polygons, convex hulls of
polygons or any region bounded by great or small circles. These
functions are reached through a language that is implemented as an
extension to MSQL Server 2000 relational database engine. The heart
of the HTM tools can also be used through various interfaces in
several langugages, like C++, C# and Java. An extensive XML
specification for describing spatial structures to support spatial
queries is also under development.

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